Zhao Forrest wrote: >> - swapping allows you to overcommit memory >> > > Normally swapping mechanism choose the Least Recently Used(LRU) pages > of a process to be swapped out. When KVM uses MMU notifier in linux > kernel to implement swapping for VM, could KVM choose LRU pages of a > VM to swap out? If so, could you give a brief description about how > this is implemented? >
The Linux memory manager approximates LRU by scanning pages for the accessed bit, which is set in the pte by the processor when a page is accessed through that pte. mmu notifiers provide a callback for the check, so that kvm can check the accessed bit on the shadow ptes. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
